aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/sprd-sc27xx-spi.c
blob: 55d2c31bdfb205e50a5d2d9967cbd277f5a399d2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2017 Spreadtrum Communications Inc.
 */

#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/core.h>
#include <linux/mfd/sc27xx-pmic.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <uapi/linux/usb/charger.h>

#define SPRD_PMIC_INT_MASK_STATUS	0x0
#define SPRD_PMIC_INT_RAW_STATUS	0x4
#define SPRD_PMIC_INT_EN		0x8

#define SPRD_SC2730_IRQ_BASE		0x80
#define SPRD_SC2730_IRQ_NUMS		10
#define SPRD_SC2730_CHG_DET		0x1b9c
#define SPRD_SC2731_IRQ_BASE		0x140
#define SPRD_SC2731_IRQ_NUMS		16
#define SPRD_SC2731_CHG_DET		0xedc

/* PMIC charger detection definition */
#define SPRD_PMIC_CHG_DET_DELAY_US	200000
#define SPRD_PMIC_CHG_DET_TIMEOUT	2000000
#define SPRD_PMIC_CHG_DET_DONE		BIT(11)
#define SPRD_PMIC_SDP_TYPE		BIT(7)
#define SPRD_PMIC_DCP_TYPE		BIT(6)
#define SPRD_PMIC_CDP_TYPE		BIT(5)
#define SPRD_PMIC_CHG_TYPE_MASK		GENMASK(7, 5)

struct sprd_pmic {
	struct regmap *regmap;
	struct device *dev;
	struct regmap_irq *irqs;
	struct regmap_irq_chip irq_chip;
	struct regmap_irq_chip_data *irq_data;
	const struct sprd_pmic_data *pdata;
	int irq;
};

struct sprd_pmic_data {
	u32 irq_base;
	u32 num_irqs;
	u32 charger_det;
};

/*
 * Since different PMICs of SC27xx series can have different interrupt
 * base address and irq number, we should save irq number and irq base
 * in the device data structure.
 */
static const struct sprd_pmic_data sc2730_data = {
	.irq_base = SPRD_SC2730_IRQ_BASE,
	.num_irqs = SPRD_SC2730_IRQ_NUMS,
	.charger_det = SPRD_SC2730_CHG_DET,
};

static const struct sprd_pmic_data sc2731_data = {
	.irq_base = SPRD_SC2731_IRQ_BASE,
	.num_irqs = SPRD_SC2731_IRQ_NUMS,
	.charger_det = SPRD_SC2731_CHG_DET,
};

enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct sprd_pmic *ddata = spi_get_drvdata(spi);
	const struct sprd_pmic_data *pdata = ddata->pdata;
	enum usb_charger_type type;
	u32 val;
	int ret;

	ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
				       (val & SPRD_PMIC_CHG_DET_DONE),
				       SPRD_PMIC_CHG_DET_DELAY_US,
				       SPRD_PMIC_CHG_DET_TIMEOUT);
	if (ret) {
		dev_err(&spi->dev, "failed to detect charger type\n");
		return UNKNOWN_TYPE;
	}

	switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
	case SPRD_PMIC_CDP_TYPE:
		type = CDP_TYPE;
		break;
	case SPRD_PMIC_DCP_TYPE:
		type = DCP_TYPE;
		break;
	case SPRD_PMIC_SDP_TYPE:
		type = SDP_TYPE;
		break;
	default:
		type = UNKNOWN_TYPE;
		break;
	}

	return type;
}
EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);

static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
{
	struct device *dev = context;
	struct spi_device *spi = to_spi_device(dev);

	return spi_write(spi, data, count);
}

static int sprd_pmic_spi_read(void *context,
			      const void *reg, size_t reg_size,
			      void *val, size_t val_size)
{
	struct device *dev = context;
	struct spi_device *spi = to_spi_device(dev);
	u32 rx_buf[2] = { 0 };
	int ret;

	/* Now we only support one PMIC register to read every time. */
	if (reg_size != sizeof(u32) || val_size != sizeof(u32))
		return -EINVAL;

	/* Copy address to read from into first element of SPI buffer. */
	memcpy(rx_buf, reg, sizeof(u32));
	ret = spi_read(spi, rx_buf, 1);
	if (ret < 0)
		return ret;

	memcpy(val, rx_buf, val_size);
	return 0;
}

static struct regmap_bus sprd_pmic_regmap = {
	.write = sprd_pmic_spi_write,
	.read = sprd_pmic_spi_read,
	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
};

static const struct regmap_config sprd_pmic_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.max_register = 0xffff,
};

static int sprd_pmic_probe(struct spi_device *spi)
{
	struct sprd_pmic *ddata;
	const struct sprd_pmic_data *pdata;
	int ret, i;

	pdata = of_device_get_match_data(&spi->dev);
	if (!pdata) {
		dev_err(&spi->dev, "No matching driver data found\n");
		return -EINVAL;
	}

	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
		return -ENOMEM;

	ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
					 &spi->dev, &sprd_pmic_config);
	if (IS_ERR(ddata->regmap)) {
		ret = PTR_ERR(ddata->regmap);
		dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
		return ret;
	}

	spi_set_drvdata(spi, ddata);
	ddata->dev = &spi->dev;
	ddata->irq = spi->irq;
	ddata->pdata = pdata;

	ddata->irq_chip.name = dev_name(&spi->dev);
	ddata->irq_chip.status_base =
		pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
	ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
	ddata->irq_chip.ack_base = 0;
	ddata->irq_chip.num_regs = 1;
	ddata->irq_chip.num_irqs = pdata->num_irqs;
	ddata->irq_chip.mask_invert = true;

	ddata->irqs = devm_kcalloc(&spi->dev,
				   pdata->num_irqs, sizeof(struct regmap_irq),
				   GFP_KERNEL);
	if (!ddata->irqs)
		return -ENOMEM;

	ddata->irq_chip.irqs = ddata->irqs;
	for (i = 0; i < pdata->num_irqs; i++)
		ddata->irqs[i].mask = BIT(i);

	ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
				       IRQF_ONESHOT, 0,
				       &ddata->irq_chip, &ddata->irq_data);
	if (ret) {
		dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
		return ret;
	}

	ret = devm_of_platform_populate(&spi->dev);
	if (ret) {
		dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);
		return ret;
	}

	device_init_wakeup(&spi->dev, true);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int sprd_pmic_suspend(struct device *dev)
{
	struct sprd_pmic *ddata = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(ddata->irq);

	return 0;
}

static int sprd_pmic_resume(struct device *dev)
{
	struct sprd_pmic *ddata = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(ddata->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);

static const struct of_device_id sprd_pmic_match[] = {
	{ .compatible = "sprd,sc2731", .data = &sc2731_data },
	{ .compatible = "sprd,sc2730", .data = &sc2730_data },
	{},
};
MODULE_DEVICE_TABLE(of, sprd_pmic_match);

static const struct spi_device_id sprd_pmic_spi_ids[] = {
	{ .name = "sc2731", .driver_data = (unsigned long)&sc2731_data },
	{},
};
MODULE_DEVICE_TABLE(spi, sprd_pmic_spi_ids);

static struct spi_driver sprd_pmic_driver = {
	.driver = {
		.name = "sc27xx-pmic",
		.of_match_table = sprd_pmic_match,
		.pm = &sprd_pmic_pm_ops,
	},
	.probe = sprd_pmic_probe,
	.id_table = sprd_pmic_spi_ids,
};

static int __init sprd_pmic_init(void)
{
	return spi_register_driver(&sprd_pmic_driver);
}
subsys_initcall(sprd_pmic_init);

static void __exit sprd_pmic_exit(void)
{
	spi_unregister_driver(&sprd_pmic_driver);
}
module_exit(sprd_pmic_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");